基于FPGA的多通道数字信号下变频器设计  

Design of Multi-Channel Digital Signal DDC Based on FPGA

作　　者：杨宏宇[1] 姜鲁鹏[2] 惠彬[3] 

机构地区：[1]中国民航大学软件研究中心,天津300300 [2]中国民航大学天津市智能信号与图像处理重点实验室,天津300300 [3]中国石油天然气总公司长庆石油勘探局,西安710000

出　　处：《中国民航学院学报》2006年第6期1-5,共5页Journal of Civil Aviation University of China

基　　金：天津市自然科学基金项目(06YFJMJ00700);中国民用航空总局科技基金项目(MHRD0611);天津市智能信号与图像处理重点实验室开放基金项目

摘　　要：研究了无线通信接收机中,经A/D转换后到基带处理前的中频信号的下变频处理。提出了用FPGA实现多通道数字信号下变频的新设想。通过分析CIC滤波器、HB滤波器和多相滤波器的特点和性能,将它们与抽取器相结合,对A/D转换后的数据进行抽取,降低了信号采样率,减轻了后续DSP处理基带信号的压力。结合一个具体的多信道信号,通过软件仿真和在FPGA器件的实现,证明了该方案的正确性。此设计方案集CIC滤波器、HB滤波器和多相滤波器的优点于一身,使设计出的数字信号下变频器能够处理更高频率的信号。Having studied the digital down-conversion （DDC） process of IF signal before the base band process which follows A/D conversion in wireless communication,the paper puts forward a new idea of utilizing the FPGA to realize multi-channel digital signal DDC. Through analyzing the features and performances of CIC filters, HB filters and muhiphase-filter,we combine them with decimators and decimate the A/D data,thus reducing the digital signal rate and the load of DSP when processing the base band signal. In the paper,by making use of a specific rnuhi-ehannel signal,through software simulation and realization in FPFA equipment,this design is proved to be correct. The experimental results show that the feasibility of the solution is satisfactory. The DDC can process higher frequent digital signal because it takes advantage of CIC filter,HB filer and muhiphase-fiher.

关 键 词：数字下变频 FPGA 多相滤波器 软件无线电 

分 类 号：TN92[电子电信—通信与信息系统] TN911.72[电子电信—信息与通信工程]